Siemens SIMATIC FM 453 Manual page 178

Starting up the FM 453
Optimization of The following table shows you how to make parameter quality selection for
Dynamic Re-
any given axis dynamic response desired. The time values MD46 and MD47
sponse
are added to the previously documented machine data from basic startup.
These times are essentially needed on a step drive-specific basis. They
amount to a few ms. However, should the axis machinery have a tendency to
vibrate, they can be used e.g. in the case of seamless transition between ac-
celeration and delay (e.g. when traversing short distances), in order to pre-
vent the resultant doubling of acceleration jump, or to permit the vibration
which is induced at this discontinuous location, to die out by adding a
constant travel time.
Table 7-6
Soft travel behavior
Suppression of reso-
nance
Short positioning time
Triggering Test
By implementing test movements in accordance with 7-20, optimize the step-
Movements
per motor control to your requirements. Check all speed ranges, and if appli-
cable give the greatest weight in evaluating the results to the speed that is the
most significant for your technology.
Fig. 7-20 Test Movements for Optimizing the Stepper Motor Control System
7-36
Effect of Machine Data that Defines Response for the
Open-loop Controlled Operation of the Step Drive
MD54
small
great
great
Select
Mode = jogging
Speed level 2
OVER = various values
Set
Speed level 1 = 0.1 V
max
Speed level 2 = 0.5 V
max
Set
Servo = ON
Start axis
Plus or minus direction
(be sure there is enough room!)
Evaluate axis response
Additional testing desired?
Yes
No
END
FM 453 Servo Drive / Step Drive Positioning Module
MD55 MD57...60 MD46
– small great
– great great
great great small
Uniformity of movement
Tendency to vibration
Positioning time
C79000-G7076-C453-01
MD47
great
great
small